Automatic cut-off for gas-burners.



P. GETSON. AUTOMATIC CUT-OFF FOR GAS BURNERS APPLICATION FILED FEB. 6, I915- Patented Jan. 11, 1916 hwemwrs COLUMBIA PLANOGRAPH 60.,WASHINGTON. D. c.

PHILIP GETSON, OF EHILADELPHIA, PENNSYLVANIA.

AUTOMATIC CUT-OFF FOB GAS-BURNEES.

Application filed Ifebruary 6, 1915.

T 0 all whom it may concern Be it known. that I, PHILIP GETSON, M. 1)., a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have in vented a certain new and useful Automatic Cut-Off for Gas-Burners, the following of which is a specification.

It often happens that during the ignition of gas for illuminating, heating, cooking or other purposes the flame is accidentally extinguished, or the valve controlling the flow of gas is inadvertently or accidentally openedthe escaping gas causing harm to life and property.

The object of this invention, is to prevent such accidents by providing an attachment for application to a gas fixture, gas stove, or similar medium which will automatically shut off the flow of the gas-should it he accidentally or improperly extinguished.

Other and further objects of this invention consist in the providing of details of construction whereby the desired results may be properly obtained.

The invention consists of the improvements hereinafter described and finally claimed.

The nature, features, and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawings forming parts hereof and in which:

Figure 1, is a view in side elevation of the attachment, shown in application to an ordinary gas bracket, and illustrating the same in position where the flow of gas is stopped. Fig. 2 is a view of a very slightly modified form of the same device illustrating the attachment in position for permitting of the flow of gas when just ignited. Figs. 8, a, and 5 show the parts of the device separately. Fig. 6, is a view in side elevation of a gas range equipped with an attachment embodying the invention.

Referring to the drawings and more particularly to Fig. 1, 10, designates a gas fixture shown as comprising a wall bracket, and provided with a burner 11, and the usual gas cook 12. These parts may be of any well known construction and the form disclosed is merely for illustrative purposes.

Encircling burner 11 is a top-closed, airtight pipe or chamber 13, which is made of relatively thin metal so as to permit the air Specification of Letters Patent.

Patented Jan. 131, Mile.

Serial No. 6,514.

contained therein to readily respond to the influence of heat and cold.

1% represents the lower end of pipe 13. it has a small opening at the endfor purposes further described and is inserted into a liquid container 15. AS in practice the liquid conveniently used is mercury, parts 13, 1d and 15 should be made of substances not affected by mercury, such as aluminum, iron, etc. The mercury container 15 is narrower at the bottom and wider at the top for reasons subsequently stated. It is held in position by the end of a bar 16, and is counterbalanced on its opposite end by a weight 18. Bar 16 is pivotally resting on a fulcrum 17, and operates cock 21 by means of two projections 19 and 20. The projection 19 is placed perpendicularly to 16 and has pivotal relations with it and 20 is solidly attached to cock at one end and pivotally connected with 19 at its other end.

22 represents a solid wire joined pivotally to bar 16 at its upper end and having a relatively smaller solidly attached perpendicular projection 23 near its lower end.

2% is a light chain hanging freely from the lower end of 25 is a projection similar to 23 solidly attached to fixture 10 in such a position as to easily catch and hold projection 23 when it is brought and left underneath it; 23 and 25 are then at right angles to each other.

The action of the device depends upon the heating or cooling and consequent expansion and contraction of the air contained within pipe 13 and 1st which shifts the liquid {usually mercury) from the container 15 into pipe 1% and 13 and vice versa, thus causing the weights and 1S resting on the ends of bar 16 either to overbalance in one or the other direction and thus allowing he gas to flow or shutting it off through the connections of 19 and 20 with 16 and 21.

Figs. 1 and 2 are similar except that in 2 tube is incased by burner 11. Fig. 6, is a view in side elevation of a gas range equipped with an attachment embodying the invention.

To operate: Open usual cock This allows the gas to flow into the gas fixture 10. Pull chain 2-11- downward. This partly opens cook 21 and lets the gas flow into burner 11. Bring part to and underneath Let it free. As when the gas is not ignited the shiftable 1nedium-the mercuryis held in pipe 1 1- and 13 by the vacuum produced by the contraction of cooled air, weight 18 is heavier than 15. 1t overbalances, pulls part'23 against 25 and holds cock 21 in partly opened position. Ignite the gas at the burner 11. The flame heats pipe 13 and causes the air within to expand which, in a few seconds, expels the mercury through end l-ft into container 15. Container 15 becoming heavier than opposite weight 18, overbalances, opens fully cook 21, and releases part 23 from underneath 22, 23 and 24: then resume a straight-hanging position and is free to act when occasion demands without being interfered with by part 25. vVhen cock 12 is purposely closed or when the flame is accidentally or otherwise extinguished at 11, pipe 13 cools, the air contained within contracts; the vacuum formed pulls the shifting liquidthe mercuiy-itrom the container 15 into pipe 11 and 13. lVeight 18 becomes heavier, overbalances, closes cock 2. and shuts oil the gas. The whole process occurs within only a few seconds.

The object of the relatively small opening in end oi. pipe ll is to assist in holding the mercury in pipe 13 and 1 1 after the cooled and contracted air has pulled it in. It thus excellently withstands all the jarring and shaking the gas fixture 10 may be subjected to withoutallowing the mercury to fall back into container 1-3 until burner 11 is heated by the ignited gas flame.

The container 15 is wider at the top and contracted at the bottom. This enables the end 1 1 which is inserted into the shifting medium-mercurycontained in this part 15 to act on a relatively large quantity of mercury in a vessel of small depth and allows a motion upward with a minimum weight to interfere with this action when it is ready to act.

The device is capable of being attached to any gas fixture in a. few minutes.

lVhat I claim is:

1. In a device-of the class described, a gas burner, an auxiliary gas valve therefor, an air pipe or air chamber fixed in juxtaposition to said burner closed at the upper end and open at the lower end, a shiitable fluid container adjacent the lower end of the air tube and operatively connected to said valve, said tube being arranged to dip into said fluid container, whereby changes of temperature operates to shift the fluid from the contamer to the air tube and thus operates the valve.

2. In a device of the class described, a gas burner, an auxiliary gas valve therefor, a top-closed air pipe or air chamber arranged 1n juxtaposition to said burner the open lower end of which constitutes a fixed fluid container, at shiltable medium, carrying a second fluid container, which is co-actively disposed with respect to the first mentioned container, so that the contents of one container may be intermittently shifted to the other container and means operatively connecting said medium and auxiliary valve whereby air contained within said pipe or chamber when influenced by changes in temperature, resulting from the igniting and extinguishing of flame or" at said burner,

serves to shift said fluid to relatively fix the open and closed position of said auxiliary valve.

3. In a device of the class described, a fixture provided with a gas burner and its colnplemental gas cock, an auxiliary gas valve in said burner, a top-closed air pipe or air chamber arranged in juxtaposition to said burner, the open lower end of which constitutes a fixed fiuid container, a beam pivotally carried by said fixture, provided at one end with a second fluid container, arranged in co-acting relation with the first mentioned container so that the contents of the one container may be intermittently shifted to the othe container, said beam being provided at opposite end with a counterbalance and means connecting said beam and said auxiliary valve whereby air contained within said pipe or chamber when influenced by changes in temperature resulting from the igniting and extinguishing of gas at said burner, serves to shift said fluid to relatively fix the open and closed position of said auxiliary valve.

e. In a device of the class described, a fixture, provided with a gas burner and its complemental gas cock, an auxiliary gas valve for said burner, a top-closed air pipe or chamber arranged in juxtaposition to said burner, the lower open end 01" which constitutes a fixed fluid container, a beam pivotally carried by said fixture provided at one end with a second fluid container arranged in co-acting relation with the first mentioned container so that the contents of one of them may be intermittently shifted to he other of them, said beam being provided at its opposite end with a counterbalance,

means operatively connecting said beam and said auxiliary valve, and a solid elongated body connected pivotally at its upper end with said beam and having a. pull chain at its lower end and a solid perpendicular projection a little above its lower end and capable of being brought under and held when serves to shift said fluid to relatively fix the car open and closed position of said auxiliary valve and automatically release the mentioned perpendicular solid projection from the similar projection attached to the gas fixture a little away from the center of gravity of the mentioned solid elongated body.

5. In a device of the class described, a fixture, provided with a gas burner and its complemental gas cock, an auxiliary gas valve for said burner, a top-closed air pipe or air chamber arranged in juxtaposition to said burner, the lower open end of which constitutes a fixed fluid container, a beam pivotally carried by said fixture provided at one end with a second fluid container arranged in co-acting relation with the first mentioned container so that the contents of one of them may be intermittently shifted to the other of them, said beam being provided at its opposite end with a counterbalance, means operatively connecting said beam and said auxiliary valve, and a solid elongated body connected pivotally at its upper end with said beam and having a pull chain at its lower end and a solid perpendicular projection a little above its lower end, a similar projection attached to the main gas fixture a little away from the center of gravity of the mentioned solid elongated body capable of holding the perpendicular pro ection extending from the lower portion of said elongated body when this is brought under and at right angles to it for initially opening said auxiliary valve whereby air contained within said chamber when influenced by changes in temperature, resulting from the igniting and extinguishing of gas at said burner, serves to shift said fluid to relatively fix the open and closed position of said auxiliary valve and automatically release the mentioned perpendicular solid projection from the similar projection attached to the gas fixture a little away from the center of gravity of the mentioned solid elongated body.

In testimony thereof, I have hereunto signed my name in the presence of wit nesses.

PHILIP GETSON.

Vitnesses MAURIoE SoBoLorr, JAoon N. MARKs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

